Hanging Buffer Mount

This is a hanging mount for the Original MMU2(s) Filament Buffer.
[PC4-M6 Version]

Features:

• Quick & Easy to load
• Reuses most of the original parts
• Keeps the Buffer out of the way
• Clean simple filament path to the MMU2(s) (Prevents MMU malfunctions caused by PTFE tubes twisting the filament)

EDIT: 9/10/2020 Modified the main body so the Lock hook can be printed laying down. This will make the hook stronger.

Print instructions

How does it work

Printing:
PETG Recommended - It helps make the latch hook flexible enough to open easily.
2 Perimeter Layers
5% Infill
No Supports needed
This mount is 24 cm long

Hardware:
10x PC4-M6 Tube connector (Test your threads with the ConnectorThreadTest.stl file. Make sure you have the correct sized threads)
6-20 feet of 4mm OD (Outer Diameter) 3mm ID (Inner Diameter) PTFE Tubing. I use this all the way up to the MMU but NOT from the MMU to the Extruder.
4x Drywall Screws for mounting to the ceiling or shelf
1x M3 x 40 mm screw
1x M3 lock nut - USE A LOCK NUT! You should have one in your spare parts bag. And only tighten the bolt enough to engage the nylon lock. It should remain loose enough for the hinge to move freely

Other Suggested Items

• Filament Management System
• Hanging Mount for Rubbermaid 21 cup Drybox
• Hanging Side Mount
• Spool Skate
• Drybox Desiccant Dome
• PTFE Tube Cap
• PC4 - M10 Cap
• Double Stack Ikea LACK Enclosure

Design Choices For those of you that are curious

I chose not to use Passthrough PC4-M10 connectors because they did not test well in early designs. When a spool would get tangled or knotted the filament would get pulled so tight that the PTFE tube would push all the way through the Buffer to the other tube on the other side. So I switched to PC4-M6 connectors to keep the tube always in the exact place it needs to be. But if you REALLY want to use them here is the Passthrough PC4-M10 version.

The MMU2(s) works a LOT better when the PTFE tubes leading up to it are straight and come up from the lower back of the printer. This prevents the Filament from spinning and twisting inside the tube. This helps to keep the filament curved the correct direction to go through the MMU with the correct alignment. So keep enough slack in the Tubes to allow for this but not so much extra slack that it has to curve to one side.

Using the 3mm ID PTFE tube makes it way easier to load and especially unload filament. When the Extruder leaves a blunted tip on the filament it can become very difficult to pull back out of a 2mm ID PTFE tube like the ones that ship with the MMU2(s)

By locating the buffer inside the Enclosure the exposed filament stays dry by the warm air all around it. It also keeps the filament path to the MMU clean and straight.